84
INS
TALLER
U
SER
M
AINTEN
AN
CE
TECHNI
CI
AN
TECHNI
CAL
D
AT
A
- In the "Combustion" window, modify and confirm the type of gas on the line "Gas type": “nG” for methane gas, “LG” for LPG gas and
“AP” for propane air (Par. 2.6).
- Carry out complete calibration (Par. 3.11); during the procedure check and, if necessary, correct the CO
2
value.
- Upon completing the conversion, apply the sticker regarding the modified gas content onto the data nameplate in the connection box.
The pressure testers used for calibration should be perfectly closed and there should be no
leaks from the gas circuit.
Checks following conversion to another type of gas.
These adjustments must be made with reference to the type of gas used, following the indications given in the table (Par. 4.2).
After having made sure that the conversion is complete and that the calibration has been successful, you must make sure that:
- there is no flame in the combustion chamber;
- the burner flame is not too high or low and that it is stable (does not detach from burner);
Maintenance operations must be carried out by an authorised company (e.g. Authorised After-Sales Technical Assistance Cen-
tre).
Risk of material damage after using sprays and liquids to search for leaks
Leak sprays and liquids clog the reference hole P.Ref. (Fig. 55) of the gas valve, damaging it irreparably.
During installation and maintenance, do not use spray or liquids in the upper area of the gas valve (side referring to the electric
connections).
1
4
3
2
5
55
Key (Fig. 55):
1
- Gas valve outlet pressure point
2 - Coil
3
- Wiring connector
4
- Gas valve inlet pressure point
5
- P. Ref. (Reference pressure)
3.10 CALIBRATION TYPE INVOLVING THE REPLACEMENT OF A COMPONENT.
When performing extraordinary maintenance on the boiler, involving the replacement of a component, such as the P.C.B. (if the remov-
able memory is not put into the replacement board) or components in the air, gas and flame control circuits, the boiler will need to be
calibrated.
Select the type of calibration to be carried out according to the table below.